Wireless communication system, apparatus and method

ABSTRACT

A mobile station apparatus that transmits a physical uplink control channel and computes a transmit power for a physical uplink control channel transmission in a subframe based on a physical uplink control channel format for the physical uplink control channel transmission in the subframe. The mobile station apparatus assumes that the transmit power for the physical uplink control channel transmission in the subframe is computed based on a predefined physical uplink control channel format in a case that the mobile station apparatus does not transmit the physical uplink control channel in the subframe.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of co-pending U.S. application Ser.No. 13/458,177 filed on Apr. 27, 2012, which is a Continuation of PCTInternational Application No. PCT/JP2010/066326 filed on Sep. 21, 2010,which claims the benefit to Patent Application No. 2009-247497 filed inJapan, on Oct. 28, 2009, all of which are hereby expressly incorporatedby reference into the present application.

TECHNICAL FIELD

The present invention relates to a technology in which a mobile stationapparatus transmits to a base station apparatus a remaining power value(power headroom) which is a difference between maximum transmit powerand predetermined power estimated for uplink transmission.

BACKGROUND ART

In an uplink in wireless network evolution (hereinafter referred to as“LTE (Long Term Evolution)” or “EUTRA (Evolved Universal TerrestrialRadio Access)”), TPC (Transmit Power Control) is performed for thepurpose of suppressing power consumption of a mobile station apparatus,or reducing given interference to other cells. Shown is a formula usedto decide a transmit power value of a PUSCH (Physical Uplink SharedCHannel) used for uplink data communication specified in Chapter 5 inNon-patent Document 1.

$\begin{matrix}\left\lbrack {{Formula}\mspace{14mu} 1} \right\rbrack & \; \\\begin{matrix}{{P_{PUSCH}(i)} = {\min \begin{Bmatrix}{P_{CMAX},{{10\; {\log_{10}\left( {M_{PUSCH}(i)} \right)}} +}} \\{{P_{O\_ {PUSCH}}(j)} + {{\alpha (j)} \cdot {PL}} + {\Delta_{TF}(i)} + {f(i)}}\end{Bmatrix}}} \\{= {\min \left\{ {P_{CMAX},P_{req}} \right\}}}\end{matrix} & (1)\end{matrix}$

In Formula (1), P_(PUSCH)(i) indicates a transmit power value of thePUSCH in an i-th subframe. Min {X, Y} is a function for selecting aminimum value of X and Y. P_(O) _(—) _(PUSCH) is transmit power as thebasis for the PUSCH, and is a value specified by a higher layer.M_(PUSCH) indicates the number of PRBs (Physical Resource Block), whichis a unit for radio resource assignment used for PUSCH transmission,etc., and indicates that the transmit power becomes larger as the numberof PRBs used for PUSCH transmission increases. In addition, PL indicatesa path loss, and α is a coefficient multiplied to the path loss and isspecified by the higher layer. Δ_(TF) is an offset value dependent on amodulation scheme etc., and f is an offset value (transmit power controlvalue by a closed loop or an open loop) calculated by a TPC commandtransmitted by DCI (Downlink Control Information). In addition, P_(CMAX)is a maximum transmit power value, and may be physical maximum transmitpower or may be specified by the higher layer. P_(req) is a transmitpower value of the PUSCH calculated so as to satisfy a predeterminedcommunication quality.

In addition, in order for a base station apparatus to recognize how muchremaining power the mobile station apparatus has with respect to themaximum transmit power value P_(CMAX) when transmitting the PUSCH, themobile station apparatus informs the base station apparatus of a valueobtained by subtracting a predetermined power value estimated for uplinktransmission from a maximum transmit power value of a terminal, thevalue being called a PH (Power Headroom). The PH is defined by Formula(2) in Chapter 5 in Non-patent Document 1.

[Formula 2]

PH(i)=P _(CMAX) −P _(req)   (2)

The PH is rounded off to values of −23 dB to 40 dB per dB, is informedfrom a physical layer to the higher layer, and is transmitted to thebase station apparatus. A positive PH indicates that the mobile stationapparatus has remaining transmit power, and a negative PH indicates astate where the terminal is performing transmission with the maximumtransmit power although transmit power exceeding the maximum transmitpower value is requested to the mobile station apparatus from the basestation. The base station apparatus decides a bandwidth allocated forthe mobile station apparatus to transmit the PUSCH, a modulation schemeof the PUSCH, etc. according to the PH.

Next, shown is a formula used to decide a transmit power value of aPUCCH (Physical Uplink Control Channel) used for communication of uplinkcontrol information specified in Chapter 5 in Non-patent Document 1.

$\begin{matrix}\left\lbrack {{Formula}\mspace{14mu} 3} \right\rbrack & \; \\\begin{matrix}{{P_{PUCCH}(i)} = {\min \begin{Bmatrix}{P_{CMAX},{{P_{O\_ {PUSCH}}(j)} + {PL} +}} \\{{h\left( {n_{CQI},n_{HARQ}} \right)} + {\Delta_{F\_ {PUCCH}}(F)} +} \\{g(i)}\end{Bmatrix}}} \\{= {\min \left\{ {P_{CMAX},P_{{req}\_ {PUCCH}}} \right\}}}\end{matrix} & (3)\end{matrix}$

In Formula (3), P_(PUCCH)(i) indicates a transmit power value of thePUCCH in an i-th subframe. P_(O) _(—) _(PUCCH) is a transmit power asthe basis for the PUCCH, and is a value specified by the higher layer. h(n_(CQI), n_(HARQ)) is a value calculated by the number of bitstransmitted by the PUCCH and a format of the PUCCH, n_(CQI) indicatesCQI (Channel Quality Information) transmitted by the PUCCH, and n_(HARQ)indicates the number of HARQ bits (ACK/NACK) transmitted by the PUCCH.Δ_(F) _(—) _(PUCCH) is an offset value specified from the higher layerfor each format of the PUCCH, and g is an offset value (transmit powercontrol value by the closed loop) calculated from the TPC commandtransmitted by DCI (Downlink Control Information). P_(req) _(—) _(PUCCH)is a transmit power value of the PUCCH calculated so as to satisfy apredetermined communication quality. Note that the PH with respect tothe PUCCH is not transmitted in LTE.

The formats of the PUCCH include: a PUCCH format 1, a PUCCH format 1a, aPUCCH format 1b, a PUCCH format 2, a PUCCH format 2a, and a PUCCH format2b, the PUCCH format 1 is the format used in transmitting an SR(Scheduling Request) by on-off keying, the PUCCH format 1a is the formatused in transmitting 1 bit of HARQ bit by BPSK, and the PUCCH format 1bis the format used in transmitting 2 bits of HARQ bit by QPSK.

The PUCCH format 2 is the format used in transmitting CQI (ChannelQuality Information), or used in performing joint coding of CQI (ChannelQuality Information) and the HARQ bit and transmitting them when thereexists the CQI and the HARQ bit, the PUCCH format 2a is the format usedin transmitting the CQI and 1 bit of HARQ bit using DBPSK (DifferentialBinary Phase Shift Keying) for a UL RS (Uplink Reference Signal)time-multiplexed into the PUCCH format 2a, and the PUCCH format 2b isthe format used in transmitting the CQI and 2 bits of HARQ bit usingDQPSK (Differential Quadrature Phase Shift Keying) for the UL RStime-multiplexed into the PUCCH format 2b.

Control of transmission of a PH is specified in Chapter 5 in Non-patentDocument 2. The mobile station apparatus controls transmission of the PHusing two timers (a periodicPHR-Timer and a prohibitPHR-Timer) and onevalue dl-PathlossChange which have been informed from the base stationapparatus. The mobile station apparatus decides transmission of the PHin a case applied to at least one of items described hereinafter.Namely, they are the following cases: a case where the prohibitPHR-Timerhas expired, and further a path loss has changed more than thedl-PathlossChange [dB] after the PH is transmitted by the uplink radioresource (PUSCH) as initial transmission; a case where theperiodicPHR-Timer has expired; and a case where a transmissionfunctionality of the PH is configured or reconfigured by the higherlayer, and the setting is not the setting by which transmission of thePH cannot be performed.

When the mobile station apparatus has decided transmission of the PH ata timing when the mobile station apparatus is allocated with the uplinkradio resource (PUSCH) used for initial transmission, and furtherdecides to transmit the PH based on a priority of a data signal, itcalculates the PH in the physical layer, and transmits the PH. Inaddition, the mobile station apparatus starts or restarts theperiodicPHR-Timer and the prohibitPHR-Timer.

In a wireless access system and a wireless network (hereinafter referredto as “LTE-A (Long Term Evolution-Advanced)” or “A-EUTRA (AdvancedEvolved Universal Terrestrial Radio Access)”) that achieve higher-speeddata communication utilizing a more broadband frequency band than LTE,it is required that LTE-A or A-EUTRA has backward compatibility withLTE, i.e., a base station apparatus of LTE-A simultaneously performswireless communication with mobile station apparatuses of both LTE-A andLTE, and the mobile station apparatus of LTE-A can perform wirelesscommunication with the base station apparatuses of both LTE-A and LTE,and it has been examined that the same channel structure as in LTE isused for LTE-A. For example, in LTE-A, has been proposed a technology(frequency band aggregation, also referred to as spectrum aggregation,carrier aggregation, frequency aggregation, etc.) in which a pluralityof frequency bands (hereinafter referred to as CCs (Carrier Components)or CCs (Component Carriers)) having the same channel structure as in LTEis used as one frequency band (broadband frequency band).

Specifically, in communication using frequency band aggregation, a PBCH,a PDCCH, a PDSCH, a PMCH, a PCFICH, and a PHICH are transmitted for eachdownlink carrier component, and the PUSCH, the PUCCH, and a PRACH areassigned for each uplink carrier component. Namely, frequency bandaggregation is a technology in which the base station apparatus and theplurality of mobile station apparatuses simultaneously transmit andreceive plural pieces of data information and plural pieces of controlinformation in an uplink and a downlink using the plurality of carriercomponents including the PUCCH, the PUSCH, the PDCCH, the PDSCH, etc.(refer to Chapter 5 in Non-patent Document 3).

CITATION LIST Non-Patent Document 1

Non-Patent Document 1: “3GPP TS36.213 v.8.7.0 (2009-05)”

Non-patent Document 2: “3GPP TS36.321 v.8.5.0 (2009-03)”

Non-patent Document 3: “3GPP TR36.814 v.0.4.1 (2009-02)”

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention

However, since the base station apparatus and the mobile stationapparatus have performed wireless communication in a set of uplinkcarrier component and downlink carrier component in a conventionaltechnology, it is not disclosed how transmission of a PH is controlledwhen the base station apparatus allocates the plurality of uplinkcarrier components and downlink carrier components to the mobile stationapparatus. In addition, an efficient control method of transmission ofthe PH differs depending on a frequency band to which carrier componentsto be subjected to frequency band aggregation belong, or configurationsof a transmission antenna and a PA (Power Amplifier) of the mobilestation apparatus (for example, signals of all the uplink carriercomponents are transmitted through one transmission antenna, or signalsare transmitted using a different transmission antenna for each group ofthe uplink carrier components, etc.).

In addition, there has been a problem that if no PRB for PUSCHtransmission is assigned at a timing of transmitting a PH when themobile station apparatus tries to transmit the PH of a certain uplinkcarrier component in a different uplink carrier component, the PH cannotbe calculated from Formula (1).

The present invention is made in view of the above-described problems,and an object of the present invention is to provide a wirelesscommunication system, a base station apparatus, a mobile stationapparatus, a wireless communication method, a control program for themobile station apparatus, and an integrated circuit for the base stationapparatus and the mobile station apparatus in which an efficient controlof transmission of the PH can be performed according to a frequency bandto which carrier components to be subjected to frequency bandaggregation belong, or configurations of a transmission antenna and a PAof the mobile station apparatus.

Means for Solving the Problems

(1) In order to achieve the above-described object, the presentinvention has taken the following measures. Namely, a wirelesscommunication system of the present invention is the wirelesscommunication system in which a mobile station apparatus transmits apower headroom for each uplink component carrier to a base stationapparatus, wherein the base station apparatus informs the mobile stationapparatus of a plurality of uplink component carriers on which themobile station apparatus triggers report of the power headrooms, andwherein the mobile station apparatus triggers the report of the powerheadrooms in the plurality of uplink component carriers when apredetermined condition is satisfied.

(2) In addition, in the wireless communication system of the presentinvention, the mobile station apparatus, when having triggeredtransmission of the power headrooms, and when an uplink radio resourcefor initial transmission is assigned, calculates the triggered powerheadrooms of the plurality of uplink component carriers, and transmitsthe calculated power headrooms of the plurality of uplink componentcarriers by the assigned uplink radio resource for initial transmission.

(3) In addition, in the wireless communication system of the presentinvention, the base station apparatus sets to the mobile stationapparatus a plurality of downlink component carriers used for wirelesscommunication with the mobile station apparatus, and the predeterminedcondition is that a path loss value for at least one of the plurality ofdownlink component carriers set by the base station apparatus changesmore than a predetermined value.

(4) In addition, in the wireless communication system of the presentinvention, the base station apparatus sets to the mobile stationapparatus a plurality of downlink component carriers used for wirelesscommunication with the mobile station apparatus and sets to the mobilestation apparatus one specific downlink component carrier of theplurality of downlink component carriers used for wirelesscommunication, and the predetermined condition is that a path loss valuefor the one specific downlink component carrier set by the base stationapparatus changes more than a predetermined value.

(5) In addition, in the wireless communication system of the presentinvention, the base station apparatus sets one first timer(prohibitPHR-Timer) to the mobile station apparatus, and thepredetermined condition is further that the only one first timer(prohibitPHR-Timer) set by the base station apparatus has expired.

(6) In addition, in the wireless communication system of the presentinvention, the base station apparatus sets one second timer(periodicPHR-Timer) to the mobile station apparatus, and thepredetermined condition is that the only one second timer(periodicPHR-Timer) set by the base station apparatus expires.

(7) In addition, in the wireless communication system of the presentinvention, the mobile station apparatus makes the first timer(prohibitPHR-Timer) and the second timer (periodicPHR-Timer) start orrestart when having transmitted the power headrooms of the plurality ofuplink component carriers.

(8) In addition, in the wireless communication system of the presentinvention, the predetermined condition is that configuration orreconfiguration has been performed regarding a reporting functionalityof the power headroom.

(9) In addition, in the wireless communication system of the presentinvention, configuration or reconfiguration of the reportingfunctionality of the power headroom is not used to disable the reportingfunctionality.

(10) In addition, a wireless communication system of the presentinvention is the wireless communication system in which a mobile stationapparatus transmits a power headroom for each uplink component carrierto a base station apparatus, and the mobile station apparatus calculatesa power headroom of a first uplink component carrier using apredetermined resource amount of a PUSCH when transmitting the powerheadroom of the first uplink component carrier by a second uplinkcomponent carrier, and the base station apparatus determines that thepower headroom of the first uplink component carrier has been calculatedby the mobile station apparatus using the predetermined resource amountof the PUSCH.

(11) In addition, in the wireless communication system of the presentinvention, when a resource of the PUSCH is assigned to the first uplinkcomponent carrier by the base station apparatus when the mobile stationapparatus transmits the power headroom, the mobile station apparatuscalculates the power headroom of the first uplink component carrierusing the resource amount of the PUSCH allocated to the first uplinkcomponent carrier, and the base station apparatus determines that thepower headroom of the first uplink component carrier has been calculatedby the mobile station apparatus using the resource amount of the PUSCHassigned to the first uplink component carrier.

(12) In addition, in the wireless communication system of the presentinvention, the predetermined resource amount of the PUSCH is a resourceamount of the PUSCH assigned by the base station apparatus to the seconduplink component carrier which transmits the power headroom.

(13) In addition, in the wireless communication system of the presentinvention, the predetermined resource amount of the PUSCH is onephysical resource block, and the physical resource block is a unit toallocate the PUSCH to the mobile station apparatus.

(14) In addition, a wireless communication system of the presentinvention is the wireless communication system in which a mobile stationapparatus transmits a power headroom for each uplink component carrierto a base station apparatus, the mobile station apparatus calculates thepower headroom of the uplink component carrier using a predeterminedPUCCH format, and the base station apparatus determines that the powerheadroom has been calculated by the mobile station apparatus using thepredetermined PUCCH format.

(15) In addition, in the wireless communication system of the presentinvention, when transmitting a PUCCH in the uplink component carrier onwhich the power headroom is calculated when the mobile station apparatustransmits the power headroom, the mobile station apparatus calculatesthe power headroom of the uplink component carrier which transmits thePUCCH using the PUCCH format of the PUCCH to be transmitted, and thebase station apparatus determines that the power headroom of the uplinkcomponent carrier which transmits the PUCCH has been calculated by themobile station apparatus using the PUCCH format of the PUCCH to betransmitted in the uplink component carrier.

(16) In addition, a wireless communication system of the presentinvention is the wireless communication system in which a mobile stationapparatus transmits a power headroom for each uplink component carrierto a base station apparatus, the mobile station apparatus calculates thepower headroom of the uplink component carrier using an offset valuewith respect to a predetermined PUCCH format, and the base stationapparatus determines that the power headroom has been calculated by themobile station apparatus using the offset value with respect to thepredetermined PUCCH format.

(17) In addition, in the wireless communication system of the presentinvention, when transmitting the PUCCH in the uplink component carrieron which the power headroom is calculated when the mobile stationapparatus transmits the power headroom, the mobile station apparatuscalculates the power headroom of the uplink component carrier whichtransmits the PUCCH using the offset value with respect to the PUCCHformat of the PUCCH to be transmitted, and the base station apparatusdetermines that the power headroom of the uplink component carrier whichtransmits the PUCCH has been calculated by the mobile station apparatususing the offset value with respect to the PUCCH format of the PUCCH tobe transmitted in the uplink component carrier.

(18) In addition, in the wireless communication system of the presentinvention, the offset value is specified by the base station apparatusfor each PUCCH format.

(19) In addition, in the wireless communication system of the presentinvention, the offset value is calculated from the number of bits of UCItransmitted by the PUCCH.

(20) In addition, in the wireless communication system of the presentinvention, the offset value with respect to the predetermined PUCCHformat is the offset value with respect to a PUCCH format 1a used totransmit 1 bit of HARQ bit.

(21) In addition, a base station apparatus of the present invention isthe base station apparatus which receives a power headroom for eachuplink component carrier transmitted by a mobile station apparatus, andthe base station apparatus informs the mobile station apparatus of aplurality of uplink component carriers on which the mobile stationapparatus triggers report of the power headrooms.

(22) In addition, a base station apparatus of the present invention isthe base station apparatus which receives a power headroom for eachuplink component carrier transmitted by a mobile station apparatus, andwhen having received a power headroom of a first uplink componentcarrier by a second uplink component carrier, the base station apparatusdetermines that the power headroom of the first uplink component carrierhas been calculated by the mobile station apparatus using apredetermined resource amount of a PUSCH.

(23) In addition, a base station apparatus of the present invention isthe base station apparatus which receives a power headroom for eachuplink component carrier transmitted by a mobile station apparatus, andthe base station apparatus determines that the received power headroomhas been calculated by the mobile station apparatus using apredetermined PUCCH format.

(24) In addition, a base station apparatus of the present invention isthe base station apparatus which receives a power headroom for eachuplink component carrier transmitted by a mobile station apparatus, andthe base station apparatus determines that the received power headroomhas been calculated by the mobile station apparatus using an offsetvalue with respect to a predetermined PUCCH format.

(25) In addition, a mobile station apparatus of the present invention isthe mobile station apparatus which transmits a power headroom for eachuplink component carrier to a base station apparatus, and when apredetermined condition is satisfied, the mobile station apparatustriggers report of the power headrooms in the plurality of uplinkcomponent carriers.

(26) In addition, a mobile station apparatus of the present invention isthe mobile station apparatus which transmits a power headroom for eachuplink component carrier to a base station apparatus, and whentransmitting a power headroom of a first uplink component carrier by asecond uplink component carrier, the mobile station apparatus calculatesthe power headroom of the first uplink component carrier using apredetermined resource amount of a PUSCH.

(27) In addition, a mobile station apparatus of the present invention isthe mobile station apparatus which transmits a power headroom for eachuplink component carrier to a base station apparatus, and the mobilestation apparatus calculates the power headroom of the uplink componentcarrier using a predetermined PUCCH format.

(28) In addition, a mobile station apparatus of the present invention isthe mobile station apparatus which transmits a power headroom for eachuplink component carrier to a base station apparatus, and the mobilestation apparatus calculates the power headroom of the uplink componentcarrier using an offset value with respect to a predetermined PUCCHformat.

(29) In addition, a wireless communication method of the presentinvention is the wireless communication method used for a base stationapparatus which receives a power headroom for each uplink componentcarrier transmitted by a mobile station apparatus, and the base stationapparatus informs the mobile station apparatus of the plurality ofuplink component carriers on which the mobile station apparatus triggersreport of the power headrooms.

(30) In addition, a wireless communication method of the presentinvention is the wireless communication method used for a base stationapparatus which receives a power headroom for each uplink componentcarrier transmitted by a mobile station apparatus, and when havingreceived a power headroom of a first uplink component carrier by asecond uplink component carrier, the base station apparatus determinesthat the power headroom of the first uplink component carrier has beencalculated by the mobile station apparatus using a predeterminedresource amount of a PUSCH.

(31) In addition, a wireless communication method of the presentinvention is the wireless communication method used for a base stationapparatus which receives a power headroom for each uplink componentcarrier transmitted by a mobile station apparatus, and the base stationapparatus determines that the received power headroom has beencalculated by the mobile station apparatus using a predetermined PUCCHformat.

(32) In addition, a wireless communication method of the presentinvention is the wireless communication method used for a base stationapparatus which receives a power headroom for each uplink componentcarrier transmitted by a mobile station apparatus, and the base stationapparatus determines that the received power headroom has beencalculated by the mobile station apparatus using an offset value withrespect to a predetermined PUCCH format.

(33) In addition, a wireless communication method of the presentinvention is the wireless communication method used for a mobile stationapparatus which transmits a power headroom for each uplink componentcarrier to a base station apparatus, and when a predetermined conditionis satisfied, the mobile station apparatus triggers report of the powerheadrooms in the plurality of uplink component carriers.

(34) In addition, a wireless communication method of the presentinvention is the wireless communication method used for a mobile stationapparatus which transmits a power headroom for each uplink componentcarrier to a base station apparatus, and when transmitting a powerheadroom of a first uplink component carrier by a second uplinkcomponent carrier, the mobile station apparatus calculates the powerheadroom of the first uplink component carrier using a predeterminedresource amount of a PUSCH.

(35) In addition, a wireless communication method of the presentinvention is the wireless communication method used for a mobile stationapparatus which transmits a power headroom for each uplink componentcarrier to a base station apparatus, and the mobile station apparatuscalculates the power headroom of the uplink component carrier using apredetermined PUCCH format.

(36) In addition, a wireless communication method of the presentinvention is the wireless communication method used for a mobile stationapparatus which transmits a power headroom for each uplink componentcarrier to abase station apparatus, and the mobile station apparatuscalculates the power headroom of the uplink component carrier using anoffset value with respect to a predetermined PUCCH format.

(37) In addition, a control program for a mobile station apparatus ofthe present invention is the control program used for the mobile stationapparatus which transmits a power headroom for each uplink componentcarrier to a base station apparatus, and when a predetermined conditionis satisfied, processing for triggering report of the power headrooms inthe plurality of uplink component carriers has been converted into acomputer-readable and computer-executable command.

(38) In addition, a control program for a mobile station apparatus ofthe present invention is the control program used for the mobile stationapparatus which transmits a power headroom for each uplink componentcarrier to a base station apparatus, and when the mobile stationapparatus transmits a power headroom of a first uplink component carrierby a second uplink component carrier, processing for calculating thepower headroom of the first uplink component carrier using apredetermined resource amount of a PUSCH has been converted into acomputer-readable and computer-executable command.

(39) In addition, a control program for a mobile station apparatus ofthe present invention is the control program used for the mobile stationapparatus which transmits a power headroom for each uplink componentcarrier to a base station apparatus, and processing for calculating thepower headroom of the uplink component carrier using a predeterminedPUCCH format has been converted into a computer-readable andcomputer-executable command.

(40) In addition, a control program for a mobile station apparatus ofthe present invention is the control program used for the mobile stationapparatus which transmits a power headroom for each uplink componentcarrier to a base station apparatus, and processing for calculating thepower headroom of the uplink component carrier using an offset valuewith respect to a predetermined PUCCH format has been converted into acomputer-readable and computer-executable command.

(41) In addition, an integrated circuit for a base station apparatus ofthe present invention is the integrated circuit used for the basestation apparatus which receives a power headroom for each uplinkcomponent carrier transmitted by a mobile station apparatus, and theintegrated circuit has a step of informing the mobile station apparatusof the plurality of uplink component carriers on which the mobilestation apparatus triggers report of the power headrooms.

(42) In addition, an integrated circuit for a base station apparatus ofthe present invention is the integrated circuit used for the basestation apparatus which receives a power headroom for each uplinkcomponent carrier transmitted by a mobile station apparatus, and whenthe base station apparatus receives the power headroom of a first uplinkcomponent carrier by a second uplink component carrier, the integratedcircuit has a step of determining that the power headroom of the firstuplink component carrier has been calculated by the mobile stationapparatus using a predetermined resource amount of a PUSCH.

(43) In addition, an integrated circuit for a base station apparatus ofthe present invention is the integrated circuit used for the basestation apparatus which receives a power headroom for each uplinkcomponent carrier transmitted by a mobile station apparatus, and thebase station apparatus determines that the received power headroom hasbeen calculated by the mobile station apparatus using a predeterminedPUCCH format.

(44) In addition, an integrated circuit for a base station apparatus ofthe present invention is the integrated circuit used for the basestation apparatus which receives a power headroom for each uplinkcomponent carrier transmitted by a mobile station apparatus, and theintegrated circuit has a step of determining that the received powerheadroom has been calculated by the mobile station apparatus using anoffset value with respect to a predetermined PUSCH format.

(45) In addition, an integrated circuit for a mobile station apparatusof the present invention is the integrated circuit used for the mobilestation apparatus which transmits a power headroom for each uplinkcomponent carrier to a base station apparatus, and the integratedcircuit has a step of triggering report of the power headrooms in theplurality of uplink component carriers when a predetermined condition issatisfied.

(46) In addition, an integrated circuit for a mobile station apparatusof the present invention is the integrated circuit used for the mobilestation apparatus which transmits a power headroom for each uplinkcomponent carrier to a base station apparatus, and when the mobilestation apparatus transmits the power headroom of a first uplinkcomponent carrier by a second uplink component carrier, the integratedcircuit has a step of calculating the power headroom of the first uplinkcomponent carrier using a predetermined resource amount of a PUSCH.

(47) In addition, an integrated circuit for a mobile station apparatusof the present invention is the integrated circuit used for the mobilestation apparatus which transmits a power headroom for each uplinkcomponent carrier to a base station apparatus, and the integratedcircuit has a step of calculating the power headroom of the uplinkcomponent carrier using a predetermined PUCCH format.

(48) In addition, an integrated circuit for a mobile station apparatusof the present invention is the integrated circuit used for the mobilestation apparatus which transmits a power headroom for each uplinkcomponent carrier to a base station apparatus, and the integratedcircuit has a step of calculating the power headroom of the uplinkcomponent carrier using an offset value with respect to a predeterminedPUCCH format.

Advantage of the Invention

According to the present invention, a mobile station apparatus canperform an efficient control of transmission of a power headroomaccording to a frequency band to which carrier components to besubjected to frequency band aggregation belong, or configurations of atransmission antenna and a power amplifier of the mobile stationapparatus.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic block diagram showing a configuration of a basestation apparatus 3 of the present invention;

FIG. 2 is a schematic block diagram showing a configuration of a mobilestation apparatus 1 of the present invention;

FIG. 3 is a sequence chart showing one example of operations of themobile station apparatus 1 and the base station apparatus 3 of thepresent invention;

FIG. 4 is a diagram showing one example of a configuration of carriercomponents according to a second embodiment of the present invention;

FIG. 5 is a diagram illustrating one example of a calculation method ofa PH according to a third embodiment of the present invention;

FIG. 6 is a conceptual illustration of a wireless communication systemof the present invention;

FIG. 7 is a diagram showing one example of frequency band aggregationprocessing of the present invention;

FIG. 8 is a diagram showing one example of a configuration of carriercomponents of the present invention;

FIG. 9 is a schematic illustration showing one example of aconfiguration of a downlink radio frame of the present invention; and

FIG. 10 is a schematic illustration showing one example of aconfiguration of an uplink radio frame of the present invention.

BEST MODES FOR CARRYING OUT THE INVENTION

Recently, a wireless access system and a wireless network that achievehigher-speed data communication (LTE-A) have been examined in 3GPP (3rdGeneration Partnership Project) utilizing evolution of a wireless accesssystem and a wireless network of cellular mobile communication (LTE) anda more broadband frequency band than LTE. In LTE, an OFDM (OrthogonalFrequency Division Multiplexing) system, which is multicarriertransmission, is used as a communication system for wirelesscommunication from a base station apparatus to a mobile stationapparatus (downlink). In addition, an SC-FDMA (Single-Carrier FrequencyDivision Multiple Access) system, which is single career transmission,is used as a communication system for wireless communication from themobile station apparatus to the base station apparatus (uplink).

In addition, in the LTE, in the downlink, assigned are an SCH(Synchronization CHannel), a PBCH (Physical Broadcast CHannel), a PDCCH(Physical Downlink Control CHannel), a PDSCH (Physical Downlink SharedCHannel), a PMCH (Physical Multicast CHannel), a PCFICH (PhysicalControl Format Indicator CHannel), and a PHICH (Physical Hybridautomatic repeat request Indicator CHannel). In addition, in the uplink,assigned are a PUSCH, a PUCCH (Physical Uplink Control CHannel), and aPRACH (Physical Random Access CHannel).

First Embodiment

Hereinafter, a first embodiment of the present invention will bedescribed in detail with reference to drawings.

<Regarding Wireless Communication System>

FIG. 6 is a conceptual illustration of a wireless communication systemof the present invention. In FIG. 6, the wireless communication systemcomprises mobile station apparatuses 1A to 1C and a base stationapparatus 3. The mobile station apparatuses 1A to 1C and the basestation apparatus 3 perform communication using frequency bandaggregation, which will be described hereinafter. FIG. 6 shows that inwireless communication from the base station apparatus 3 to the mobilestation apparatuses 1A to 1C (downlink), assigned are an SCH(Synchronization CHannel), a downlink pilot channel (alternatively, alsoreferred to as a “DL RS (Downlink Reference Signal)”), a PBCH (PhysicalBroadcast CHannel), a PDCCH (Physical Downlink Control CHannel), a PDSCH(Physical Downlink Shared CHannel), a PMCH (Physical Multicast CHannel),a PCFICH (Physical Control Format Indicator CHannel), and a PHICH(Physical Hybrid ARQ Indicator CHannel).

In addition, FIG. 6 shows that in wireless communication from the mobilestation apparatuses 1A to 1C to the base station apparatus 3 (uplink),assigned are an uplink pilot channel (alternatively, also referred to asan “UL RS (Uplink Reference Signal)”), a PUCCH (Physical Uplink ControlCHannel), a PUSCH (Physical Uplink Shared CHannel), a PRACH (PhysicalRandom Access CHannel). Hereinafter, the mobile station apparatuses 1Ato 1C are referred to as a mobile station apparatus 1.

<Regarding Frequency Band Aggregation>

FIG. 7 is a diagram showing one example of frequency band aggregationprocessing of the present invention. In FIG. 7, a horizontal axisindicates a frequency domain and a vertical axis indicates a timedomain. As shown in FIG. 7, a downlink subframe D1 is comprised ofsubframes of four carrier components (a DCC-1 (Downlink ComponentCarrier-1), a DCC-2, a DCC-3, and a DDC-4) each having a bandwidth of 20MHz. To each of the subframes of the downlink carrier components,time-multiplexed are a region in which the PDCCH is allocated indicatedby a region hatched with lattice-shaped lines, and a region in which thePDSCH is allocated indicated by a region without hatching. For example,the base station apparatus 3 allocates a signal in the PDSCHs of one ormore downlink carrier components of the four downlink carrier componentsin a certain downlink subframe, and transmits it to the mobile stationapparatus 1.

Meanwhile, an uplink subframe U1 is comprised of two carrier components(a UCC-1 (Uplink Component Carrier-1), and a UCC-2) with a bandwidth of20 MHz. To each of the subframes of the uplink carrier components,frequency-multiplexed are a region in which the PUCCH is allocatedindicated by a region hatched with oblique lattice-shaped lines, and aregion in which the PUSCH is allocated indicated by a region hatchedwith rising oblique lines from bottom left to top right. For example,the mobile station apparatus 1 allocates a signal in the PUSCH of one ormore uplink carrier components of the two uplink carrier components in acertain uplink subframe, and transmits it to the base station apparatus3.

FIG. 8 is a diagram showing one example of a configuration of carriercomponents of the present invention. In FIG. 8, a horizontal axisindicates a frequency domain, and the DCC-1 and the DCC-2, the DCC-3 andthe DCC-4, and the UCC-1 and the UCC-2 are comprised of contiguousfrequency bands in the frequency domain. When the downlink carriercomponents are comprised of the contiguous frequency bands as shown inFIG. 8, a path loss measured in each downlink carrier component tends tobe a value approximate to each other. In addition, the mobile stationapparatus 1 can transmit and receive signals of the plurality ofdownlink carrier components and the plurality of uplink carriercomponents comprised of the contiguous frequency bands using oneantenna.

<Regarding Downlink Radio Frame>

FIG. 9 is a schematic illustration showing one example of aconfiguration of a downlink radio frame of the present invention. FIG. 9shows the configuration of the radio frame in a certain downlink carriercomponent. In FIG. 9, a horizontal axis indicates a time domain and avertical axis indicates a frequency domain. As shown in FIG. 9, theradio frame of the downlink carrier component is comprised of aplurality of downlink PRB (Physical Resource Block) pairs (for example,a region surrounded with a dashed line in FIG. 9). This downlink PRBpair is a unit of radio resource allocation, etc., and is comprised of afrequency band (PRB bandwidth; 180 kHz) with a predetermined width and atime zone (two slots are equal to one subframe; 1 ms).

One downlink PRB pair is comprised of two downlink PRBs (PRB bandwidthby a slot) contiguous in the time domain. One downlink PRB (a unitsurrounded with a thick line in FIG. 9) is comprised of twelvesubcarriers (15 kHz) in the frequency domain and comprised of seven OFDMsymbols (71 μs) in the time domain.

In the time domain, there are included a slot (0.5 ms) comprised ofseven OFDM (Orthogonal Frequency Division Multiplexing) symbols (71 μs),a subframe (1 ms) comprised of two slots, and a radio frame (10 ms)comprised of ten subframes. In the frequency domain, the plurality ofdownlink PRBs is allocated according to a bandwidth of the downlinkcarrier component. Note that a unit comprised of one subcarrier and oneOFDM symbol is referred to as a downlink resource element.

Hereinafter, a channel assigned in the downlink radio frame will bedescribed. In each downlink subframe, for example, the PDCCH, the PDSCH,and the DL RS are assigned. First, the PDCCH will be described. ThePDCCH is allocated from an OFDM symbol of a head of a subframe (regionhatched with the rising oblique lines from bottom left to top right).Note that the number of OFDM symbols in which the PDCCH is allocateddiffers for each subframe. In the PDCCH, allocated is a signal of DCI(Downlink Control Information) which is comprised of informationformats, such as downlink assignment (also referred to as DL grant) anduplink grant, and which is information used for communication control.

Note that the downlink assignment is comprised of information indicatinga modulation scheme with respect to the PDSCH, information indicating acoding scheme, information indicating radio resource allocation,information regarding a HARQ (Hybrid Automatic Repeat Request), a TPCcommand, etc. In addition, the uplink grant is comprised of informationindicating a modulation scheme with respect to the PUSCH, informationindicating the coding scheme, information indicating radio resourceallocation, information regarding the HARQ, the TPC command, etc. Notethat the HARQ is a technology in which for example, when the mobilestation apparatus 1 (base station apparatus 3) transmits success/failure(ACK/NACK) of decoding of data information to the base station apparatus3 (mobile station apparatus 1), and the mobile station apparatus 1 (basestation apparatus 3) cannot decode the data information due to an error(NACK), the base station apparatus 3 (mobile station apparatus 1)retransmits the signal, and the mobile station apparatus 1 (base stationapparatus 3) performs decoding processing with respect to a compositesignal of the signal received again and the already received signal.

Next, the PDSCH will be described. The PDSCH is allocated in an OFDMsymbol (region without hatching) other than the OFDM symbol in which thePDCCH of the subframe is allocated. A signal (referred to as a datasignal) of data information (Transport Block) is allocated in the PDSCH.A radio resource of the PDSCH is assigned using downlink assignment, andis allocated in the same downlink subframe as the PDCCH including thedownlink assignment. Although an illustration of the DL RS is omitted inFIG. 9 for simplifying a description, the DL RS is decentrally allocatedin the frequency domain and the time domain.

<Regarding Uplink Radio Frame>

FIG. 10 is a schematic illustration showing one example of aconfiguration of an uplink radio frame of the present invention. FIG. 10shows a configuration of the radio frame in a certain uplink carriercomponent. In FIG. 10, a horizontal axis indicates a time domain and avertical axis indicates a frequency domain. As shown in FIG. 10, theradio frame of the uplink carrier component is comprised of a pluralityof uplink PRB pairs (for example, a region surrounded with a dashed linein FIG. 10). This uplink PRB pair is a unit of radio resourceallocation, etc., and is comprised of a frequency band (PRB bandwidth;180 kHz) with a predetermined width and a time zone (two slots are equalto one subframe; 1 ms).

One uplink PRB pair is comprised of continuous two uplink PRBs (PRBbandwidth by slot) in the time domain. One uplink PRB (a unit surroundedwith a thick line in FIG. 10) is comprised of twelve subcarriers (15kHz) in the frequency domain and comprised of seven SC-FDMA symbols (71μs) in the time domain. In the time domain, there are included a slot(0.5 ms) comprised of seven SC-FDMA (Single-Carrier Frequency DivisionMultiple Access) symbols (71 μs), a subframe (1 ms) comprised of twoslots, and a radio frame (10 ms) comprised of ten subframes. In thefrequency domain, the plurality of uplink PRBs is allocated according toa bandwidth of the uplink carrier component. Note that a unit comprisedof one subcarrier and one SC-FDMA symbol is referred to as an uplinkresource element.

Hereinafter, a channel assigned in the uplink radio frame will bedescribed. In each uplink subframe, for example, the PUCCH, the PUSCH,and the UL RS are assigned. First, the PUCCH will be described. ThePUCCH is assigned to an uplink PRB pair (region hatched with the risingoblique lines from bottom left to top right) of both ends of a bandwidthof the uplink carrier component. In the PUCCH, allocated is a signal ofUCI (Uplink Control Information) which is the information used forcontrolling communication, such as channel quality informationindicating a downlink channel quality, an SR (Scheduling Request)indicating a request for uplink radio resource allocation, and ACK/NACKwith respect to the PDSCH.

Next, the PUSCH will be described. The PUSCH is assigned to an uplinkPRB pair (region without hatching) other than the uplink PRB in whichthe PUCCH is allocated. In the PUSCH, allocated is a signal of the UCIand data information (Transport Block), which is the information otherthan the UCI. A radio resource of the PUSCH is assigned using uplinkgrant, and is allocated in an uplink subframe of a subframe after apredetermined time has passed since the subframe received the PDCCHincluding the uplink grant. Although the UL RS is time-multiplexed withthe PUCCH and the PUSCH, a detailed description thereof is omitted forsimplifying the description.

<Regarding Configuration of Base Station Apparatus 3>

FIG. 1 is a schematic block diagram showing a configuration of the basestation apparatus 3 of the present invention. As shown in the drawing,the base station apparatus 3 is configured to include a higher layerprocessing unit 101, a control unit 103, a reception unit 105, atransmission unit 107, and a transmission/reception antenna 109. Inaddition, the higher layer processing unit 101 is configured to includea radio resource control unit 1011 and a power headroom setting unit1013. In addition, the reception unit 105 is configured to include adecoding unit 1051, a demodulation unit 1053, a multiplex separationunit 1055, and a radio reception unit 1057. In addition, thetransmission unit 107 is configured to include a coding unit 1071, amodulation unit 1073, a multiplexing unit 1075, a radio transmissionunit 1077, and a DL RS generation unit 1079. Note that in FIG. 1, thebase station apparatus 3 performs transmission of a plurality ofdownlink carrier components and reception of a plurality of uplinkcarrier component through the one transmission/reception antenna 109.

The higher layer processing unit 101 outputs data information for eachdownlink carrier component to the transmission unit 107. In addition,the higher layer processing unit 101 performs processing of a PDCP(Packet Data Convergence Protocol) layer, an RLC (Radio Link Control)layer, and an RRC (Radio Resource Control) layer. The radio resourcecontrol unit 1011 comprised in the higher layer processing unit 101allocates the plurality of uplink carrier components and downlinkcarrier components to the mobile station apparatus 1 according to thenumber of downlink carrier components and uplink carrier componentswhich can be used for wireless communication by the base stationapparatus 3, and the number of downlink carrier components and uplinkcarrier components which can be simultaneously transmitted or receivedby the mobile station apparatus 1, etc.

In addition, the radio resource control unit 1011 generates informationto be allocated in each channel of the each downlink carrier component,or obtains it from a higher node, and outputs it to the transmissionunit 107. In addition, the radio resource control unit 1011 allocates tothe mobile station apparatus 1 a radio resource in which the mobilestation apparatus 1 allocates the PUSCH (data information) of the radioresources of the uplink carrier component allocated to the mobilestation apparatus 1. In addition, the radio resource control unit 1011decides a radio resource in which the PDSCH (data information) isallocated among the radio resources of the downlink carrier component.The radio resource control unit 1011 generates downlink assignment anduplink grant indicating the radio resource allocation, and transmitsthem to the mobile station apparatus 1 through the transmission unit107.

Note that the radio resource control unit 1011 controls an amount of aradio resource of the PUSCH to be allocated to the mobile stationapparatus 1 based on a remaining power value (PH) with respect to thePUSCH received from the mobile station apparatus 1. Hereinafter, a PHwith respect to the PUSCH is simply referred to as the PH in the firstto fourth embodiments. Specifically, when a PH received from the mobilestation apparatus 1 is positive, the base station apparatus 3 determinesthat the mobile station apparatus 1 still has remaining transmit power,and allocates much more radio resources for PUSCH transmission to themobile station apparatus 1, and when the PH received from the mobilestation apparatus 1 is negative, the base station apparatus 3 determinesto have requested to the mobile station apparatus 1 transmit powerexceeding a maximum transmit power value of the mobile station apparatus1, and allocates much less radio resources for PUSCH transmission to themobile station apparatus 1.

In addition, the radio resource control unit 1011 generates controlinformation in order to control the reception unit 105 and thetransmission unit 107 based on UCI (ACK/NACK, channel qualityinformation, an SR) informed through the PUCCH by the mobile stationapparatus 1, and a buffer condition informed from the mobile stationapparatus 1, and various setting information of the each mobile stationapparatus 1 set by the radio resource control unit 1011, and outputs thecontrol information to the control unit 103.

The power headroom setting unit 1013 sets, for each mobile stationapparatus 1, a periodicPHR-Timer, a prohibitPHR-Timer, adl-PathlossChange, downlink carrier component on which path losses aremonitored in order to control a PH, and a maximum transmit power valuefor each uplink carrier component, generates information regarding thesetting, and transmits it to the mobile station apparatus 1 through thetransmission unit 107. Note that the maximum transmit power value is themaximum power value which can be used in the mobile station apparatus 1transmitting an uplink channel. In addition, the power headroom settingunit 1013 can also perform setting so that the mobile station apparatus1 may not transmit the PH for each uplink carrier component.

The control unit 103 generates a control signal which performs controlof the reception unit 105 and the transmission unit 107 based on thecontrol information from the higher layer processing unit 101. Thecontrol unit 103 outputs the generated control signal to the receptionunit 105 and the transmission unit 107, and performs control of thereception unit 105 and the transmission unit 107.

The reception unit 105 separates, demodulates, and decodes the receivedsignal received from the mobile station apparatus 1 through thetransmission/reception antenna 109 according to the control signal inputfrom the control unit 103, and outputs the decoded information to thehigher layer processing unit 101. The radio reception unit 1057 converts(down-converts) into an intermediate frequency the signal of the eachuplink carrier component received through the transmission/receptionantenna, removes an unnecessary frequency component, controls anamplification level so that a signal level is maintained appropriately,orthogonally demodulates the signal based on an in-phase component andan orthogonal component of the received signal, and converts theorthogonally demodulated analog signal into a digital signal. The radioreception unit 1057 removes a portion corresponding to a GI (GuardInterval) from the converted digital signal. The radio reception unit1057 performs FFT (Fast Fourier Transform) with respect to the signalfrom which the GI has been removed, extracts a signal in the frequencydomain, and outputs it to the multiplex separation unit 1055.

The multiplex separation unit 1055 separates the signals input from theradio reception unit 1057 into signals, such as the PUCCH, the PUSCH,and the UL RS for each uplink carrier component, respectively. Note thatthis separation is performed based on the allocation information of theradio resource which the base station apparatus 3 has previously decidedand has informed each mobile station apparatus 1. In addition, themultiplex separation unit 1055 calculates an estimate value of a channelfrom the separated UL RS, and compensates for the channel of the PUCCHand the PUSCH.

The demodulation unit 1053 performs IDFT (Inverse Discrete FourierTransform) of the PUSCH, obtains a modulation symbol, and demodulatesthe received signal with respect to each modulation symbol of the PUCCHand the PUSCH using a predetermined modulation scheme or a modulationscheme which the base station apparatus 3 has previously informed theeach mobile station apparatus 1 in the uplink grant, such as BPSK(Binary Phase Shift Keying), QPSK (Quadrature Phase Shift Keying), 16QAM(16 Quadrature Amplitude Modulation), and 64QAM (64 Quadrature AmplitudeModulation). The decoding unit 1051 decodes the demodulated encoded bitsof the PUCCH and the PUSCH using a coding rate of a predetermined codingscheme which is predetermined or previously informed to the mobilestation apparatus 1 by the base station apparatus 3 in the uplink grant,and outputs the decoded data information and the UCI to the higher layerprocessing unit 101.

The transmission unit 107 generates a DL RS according to the controlsignal input from the control unit 103, encodes and modulates the datainformation and the DCI which have been input from the higher layerprocessing unit 101, multiplexes the PDCCH, the PDSCH, and the DL RS,and transmits the signal to the mobile station apparatus 1 through thetransmission/reception antenna 109. The coding unit 1071 performscoding, such as turbo coding, convolution coding, block coding, of theDCI of each downlink carrier component and data information which havebeen input from the higher layer processing unit 101. The modulationunit 1073 modulates the coded bit using a modulation scheme, such asQPSK, 16QAM, and 64QAM. The DL RS generation unit 1079 generates as a DLRS a known sequence of the mobile station apparatus 1 which can becalculated by a rule predetermined based on a cell ID for identifyingthe base station apparatus 3. The multiplexing unit 1075 multiplexeseach modulated channel and the generated DL RS.

The radio transmission unit 1077 performs IFFT (Inverse Fast FourierTransform) of the multiplexed modulation symbol to thereby performmodulation of an OFDM system, adds a GI to the OFDM-modulated OFDMsymbol, generates a digital signal of a baseband, converts the digitalsignal of the baseband into an analog signal, generates an in-phasecomponent and an orthogonal component of an intermediate frequency fromthe analog signal, removes an excessive frequency component with respectto an intermediate frequency band, converts (up-converts) a signal withthe intermediate frequency into a signal with a high frequency, removesan excessive frequency component, amplifies power, and outputs thesignal to the transmission/reception antenna 109 to transmit.

<Regarding Configuration of Mobile Station Apparatus 1>

FIG. 2 is a schematic block diagram showing a configuration of themobile station apparatus 1 of the present invention. As shown in thedrawing, the mobile station apparatus 1 is configured to include ahigher layer processing unit 201, a control unit 203, a reception unit205, a transmission unit 207, a path loss measurement unit 209, and atransmission/reception antenna 211. In addition, the higher layerprocessing unit 201 is configured to include a radio resource controlunit 2011, a transmit power control unit 2013, and a power headroomcontrol unit 2015. In addition, the reception unit 205 is configured toinclude a decoding unit 2051, a demodulation unit 2053, a multiplexseparation unit 2055, and a radio reception unit 2057. In addition, thetransmission unit 207 is configured to include a coding unit 2071, amodulation unit 2073, a multiplexing unit 2075, a radio transmissionunit 2077, and a UL RS generation unit 2079. Note that in FIG. 2, themobile station apparatus 1 performs reception of a plurality of downlinkcarrier components, and transmission of a plurality of uplink carriercomponents through the one transmission/reception antenna 211.

The higher layer processing unit 201 outputs data information for eachuplink carrier component generated by user operation etc. to thetransmission unit 207. In addition, the higher layer processing unit 201performs processing of the PDCP layer, the RLC layer, and the RRC layer.The radio resource control unit 2011 comprised in the higher layerprocessing unit 201 manages various setting information, such as thedownlink carrier component and the uplink carrier component, assigned tothe mobile station apparatus 1 itself. In addition, the radio resourcecontrol unit 2011 generates information to be allocated in each channelof the each uplink carrier component, and outputs it to the transmissionunit 207 for each uplink carrier component. The radio resource controlunit 2011 generates control information in order to control thereception unit 205 and the transmission unit 207 based on the DCI (forexample, downlink assignment, and uplink grant) informed through thePDCCH by the base station apparatus 3, and various setting informationof the mobile station apparatus 1 itself managed by the radio resourcecontrol unit 2011, and outputs the control information to the controlunit 203.

In the transmit power control unit 2013 comprised in the higher layerprocessing unit 201, transmit power P_(req) for satisfying apredetermined communication quality for each uplink carrier component inthe base station apparatus 3, and transmit power P_(PUSCH)) of the PUSCHwhich is actually used by the mobile station apparatus 1 are calculatedbased on Formula (1) using a modulation scheme and radio resourceallocation of the PUSCH which are informed by downlink assignment, a TPCcommand, a path loss of the downlink carrier component input from thepath loss measurement unit 209, a parameter informed from the basestation apparatus 3, etc. The transmit power of the PUSCH can also berepresented as transmit power of UL-SCH (Uplink Shared CHannel)allocated in the PUSCH. The UL-SCH is a transport channel transmittedthrough the PUSCH.

When the transmit power control unit 2013 is instructed to calculate aPH from the power headroom control unit 2015, it calculates the PHs ofall the uplink carrier components assigned from the base stationapparatus 3 based on Formula (2), and transmits them to the base stationapparatus 3 through the transmission unit 207. Note that a M_(PUSCH) incalculating a PH is defined to be the number of PRBs for PUSCHtransmission assigned to each of the uplink carrier components at atiming when the PH is transmitted. In addition, the PH calculated foreach uplink carrier component is collectively configured as one MAC(Medium Access Control) CE (Control Element).

The power headroom control unit 2015 comprised in the higher layerprocessing unit 201 monitors change of one downlink carrier componentinformed from the base station apparatus 3 or of a path loss of thedownlink carrier component which the mobile station apparatus 1 hasaccessed first, and controls transmission of the PH using two timers(the periodicPHR-Timer and the prohibitPHR-Timer) and one valuedl-PathlossChange which have been informed from the base stationapparatus 3. The mobile station apparatus 1 decides transmission of thePH in a case applied to at least one of items described hereinafter.Decision of transmission of the PH is also referred to as trigger of aPH report. Namely, the cases where the mobile station apparatus 1decides transmission of the PH is the following: a case where theprohibitPHR-Timer has expired and further, a path loss changes more thanthe dl-PathlossChange [dB] in one downlink carrier component informedfrom the base station apparatus 3, or a downlink carrier component whichthe mobile station apparatus 1 has accessed first after the mobilestation apparatus 1 transmitting the PH in an uplink radio resource(PUSCH) as initial transmission; a case where the periodicPHR-Timer hasexpired; and a case where a transmission functionality of the PH isconfigured or reconfigured by the higher layer, and thus configurationis not the configuration by which transmission of the PH cannot beperformed.

When the mobile station apparatus 1 has decided transmission of the PHand further, decides to transmit the PH through the PUSCH based on apriority of a data signal at a timing of having been allocated with theuplink radio resource (PUSCH) used for initial transmission, the mobilestation apparatus 1 instructs the transmit power control unit 2013 tocalculate the PH and to output it to the transmission unit 207. Inaddition, the mobile station apparatus 1 starts or restarts theperiodicPHR-Timer and the prohibitPHR-Timer.

The control unit 203 generates a control signal which performs controlof the reception unit 205 and the transmission unit 207 based on thecontrol information from the higher layer processing unit 201. Thecontrol unit 203 outputs the generated control signal to the receptionunit 205 and the transmission unit 207, and performs control of thereception unit 205 and the transmission unit 207.

The reception unit 205 separates, demodulates, and decodes the receivedsignal received from the base station apparatus 3 through thetransmission/reception antenna 211 according to the control signal inputfrom the control unit 203, and outputs the decoded information to thehigher layer processing unit 101. The radio reception unit 2057 converts(down-converts) into an intermediate frequency the signal of the eachdownlink carrier component received through each transmission/receptionantenna, removes an unnecessary frequency component, controls anamplification level so that a signal level may be maintainedappropriately, orthogonally demodulates the signal based on an in-phasecomponent and an orthogonal component of the received signal, andconverts the orthogonally demodulated analog signal into a digitalsignal. The radio reception unit 2057 removes a portion corresponding tothe GI from the converted digital signal, performs FFT with respect tothe signal from which the GI has been removed, and extracts signals ofthe frequency domain.

The multiplex separation unit 2055 separates the extracted signals intothe PDCCH, the PDSCH, and the DL RS for each downlink carrier component,respectively. Note that this separation is performed based on the radioresource allocation information informed by the downlink assignment. Inaddition, the multiplex separation unit 2055 calculates a channelestimation value from the separated DL RS, and compensates for thechannel of the PDCCH and the PDSCH. In addition, the multiplexseparation unit 2055 outputs the separated DL RS to the path lossmeasurement unit 209.

The demodulation unit 2053 demodulates the PDCCH in a QPSK modulationscheme, and outputs it to the decoding unit 2051. When the decoding unit2051 tried to decode the PDCCH to succeed in decoding, it outputs thedecoded DCI to the higher layer processing unit 201. The demodulationunit 2053 demodulates the PDSCH in the modulation scheme informed bydownlink assignment, such as QPSK, 16QAM, and 64QAM, and outputs it tothe decoding unit 2051. The decoding unit 2051 decodes a coding rateinformed by the downlink assignment, and outputs the decoded datainformation to the higher layer processing unit 201.

The path loss measurement unit 209 measures a path loss for eachdownlink carrier component from the DL RS input from the multiplexseparation unit 2055, and outputs the measured path loss to the higherlayer processing unit 201.

The transmission unit 207 generates a UL RS according to the controlsignal input from the control unit 203, encodes and modulates the datainformation input from the higher layer processing unit 201, multiplexesthe PUCCH, the PUSCH, and the generated UL RS, and transmits them to thebase station apparatus 3 through the transmission/reception antenna 211.The coding unit 2071 performs coding, such as turbo coding, convolutioncoding, block coding, of the UCI of each uplink carrier component anddata information which has been input from the higher layer processingunit 201. The modulation unit 2073 modulates the encoded bit input fromthe coding unit 2071 in the modulation scheme, such as BPSK, QPSK,16QAM, and 64QAM.

The UL RS generation unit 2079 generates as a UL RS a known sequence ofthe base station apparatus 3 which can be calculated by a rulepredetermined based on a cell ID for identifying the base stationapparatus 3. The multiplexing unit 2075 performs DFT (Discrete FourierTransform) after rearranging the modulation symbols of the PUSCH inparallel, and multiplexes the PUSCH, the signal of the PUSCH, and thegenerated UL RS. The radio transmission unit 2077 performs IFFT of themultiplexed signal to modulate using an SC-FDMA system, adds the GI tothe SC-FDMA-modulated SC-FDMA symbol, generates a digital signal of abaseband, converts the digital signal of the baseband into an analogsignal, generates an in-phase component and an orthogonal component ofan intermediate frequency from the analog signal, removes an excessivefrequency component with respect to an intermediate frequency band,converts (up-converts) a signal with the intermediate frequency into asignal with a high frequency, removes an excessive frequency component,amplifies power, and outputs the signal to the transmission/receptionantenna 211 to transmit.

<Regarding Operation of Wireless Communication System>

FIG. 3 is a sequence chart showing one example of operations of themobile station apparatus 1 and the base station apparatus 3 of thepresent invention. The base station apparatus 3 informs the mobilestation apparatus 1 of information including setting regarding PHs, suchas the maximum transmit power value for each uplink carrier component,periodicPHR-Timer, the prohibitPHR-Timer, the dl-PathlossChange, and adownlink carrier component on which a path loss is monitored in order tocontrol the PH (step S100). The mobile station apparatus 1 monitors thepath loss of the downlink carrier component informed from the basestation apparatus 3, and manages the periodicPHR-Timer and theprohibitPHR-Timer which have been informed from the base stationapparatus 3 (step S101).

The mobile station apparatus 1 monitors the path loss of the downlinkcarrier component informed from the base station apparatus 3, and whenthe prohibitPHR-Timer has expired and further, the path loss changesmore than the dl-PathlossChange [dB] in the downlink carrier componentinformed from the base station apparatus 3 after the mobile stationapparatus 1 transmits the PH in the uplink radio resource (PUSCH) asinitial transmission, or when the periodicPHR-Timer has expired, or whenthe transmission functionality of the PH is configured or reconfiguredby the higher layer, and configuration is not the configuration by whichtransmission of the PH cannot be performed, the mobile station apparatusdecides transmission of the PH (step S102).

The base station apparatus 3 transmits to the mobile station apparatus 1uplink grant indicating radio resource assignment of the PUSCH forinitial transmission, etc. (step S103). When the mobile stationapparatus 1 has decided transmission of the PH and is allocated with theradio resource of the PUSCH for initial transmission, it calculates thePHs with respect to all the uplink carrier components assigned by thebase station apparatus 3 (step S104). As is mentioned later, when theradio resource for initial transmission or retransmission is notassigned to the uplink carrier component in step S104, the mobilestation apparatus calculates a PH, determining that the predeterminednumber of PRBs has been assigned to the uplink carrier component.

The mobile station apparatus 1 transmits the calculated PH using thePUSCH to which the radio resource for initial transmission has beenassigned (step S105), and starts or restarts the periodicPHR-Timer andthe prohibitPHR-Timer (step S106). The base station apparatus 3 receivesthe PUSCH which has assigned the radio resource to the mobile stationapparatus 1 in step S103, and obtains the PH (step S107). The mobilestation apparatus 1 completes processing regarding transmission andreception of the PH after steps S106 and S107, and returns to monitoringof the path loss in step S101 and to management of a timer.

Note that although the base station apparatus 3 informs the mobilestation apparatus 1 of the uplink carrier component to which frequencyband aggregation is performed in the embodiment, the base stationapparatus 3 may inform the mobile station apparatus 1 of only thedownlink carrier component used for wireless communication, and themobile station apparatus 1 may use for frequency band aggregation theuplink carrier component to which the informed downlink carriercomponent corresponds. In this case, information indicating the uplinkcarrier component corresponding to the downlink carrier component isinformed or broadcasted to the mobile station apparatus 1 from the basestation apparatus 3.

As shown in FIG. 8 when the downlink carrier components to whichfrequency band aggregation is performed are configured in the contiguousfrequency domain, path losses of the downlink carrier componentsindicate values approximate to each other, and if a path loss of anydownlink carrier component is known, the path losses of the otherdownlink carrier components can be estimated. Hence, it is onlynecessary that the mobile station apparatus 1 measures a path loss ofone downlink carrier component, and monitors change of the path loss forcontrolling a PH in the one downlink carrier component.

As described above, according to the embodiment, the mobile stationapparatus 1 manages a PH, which is a difference between a maximumtransmit power value set for each uplink carrier component and apredetermined power value estimated for uplink transmission, monitors apath loss of a predetermined downlink carrier component of the pluralityof downlink carrier components, and when a path loss of a certaindownlink carrier component changes more than a predetermined value, themobile station apparatus 1 decides transmission of the PHs for uplinktransmission corresponding to all the downlink carrier components set bythe base station apparatus 3. As a result of this, since the number ofdownlink carrier components which the mobile station apparatus 1monitors the change of the path loss can be reduced, load of the mobilestation apparatus 1 in monitoring the change of the path loss can bereduced, and timers can be managed in common in all the downlink carriercomponents, thus resulting in easy management of the timers.

Second Embodiment

Hereinafter, a second embodiment of the present invention will bedescribed. In the second embodiment of the present invention, a casewill be described where the mobile station apparatus 1 monitors thechange of the path losses of all the downlink carrier componentsassigned by the base station apparatus 3. When compared a wirelesscommunication system according to the embodiment with the wirelesscommunication system according to the first embodiment, there is adifference in the higher layer processing unit 201 of the mobile stationapparatus 1 and the higher layer processing unit 101 of the base stationapparatus 3. However, since configurations and functions of the othercomponents are the same as in the first embodiment, a description of thesame functions as in the first embodiment is omitted.

When compared with the power headroom setting unit 1013 of the higherlayer processing unit 101 of the base station apparatus 3 of the firstembodiment, there is a difference in that the PH setting unit 1013 ofthe higher layer processing unit 101 of the base station apparatus 3 ofthe embodiment does not set a downlink carrier component in which a pathloss is monitored to control a PH, and sets a differentdl-PathlossChange for each downlink carrier component. Since the otherfunctions of the power headroom setting unit 1013 according to theembodiment are the same as those of the power headroom setting unit 1013according to the first embodiment, a description of the same functionsas in the first embodiment is omitted.

When compared with the power headroom control unit 2015 of the higherlayer processing unit 201 of the mobile station apparatus 1 of the firstembodiment, there is a difference in that the power headroom controlunit 2015 of the higher layer processing unit 201 of the mobile stationapparatus 1 of the embodiment monitors the change of the path losses ofall the downlink carrier components assigned from the base stationapparatus 3. In addition, there is a difference in that the mobilestation apparatus 1 decides transmission of the PH in a case applied toan item described hereinafter. Namely, it is the case where theprohibitPHR-Timer has expired, and the path loss has changed more thanthe dl-PathlossChange [dB] set for each downlink carrier component in atleast one of the downlink carrier components assigned from the basestation apparatus 3 after the mobile station apparatus 1 transmits thePH as initial transmission.

Since the other functions of the power headroom control unit 2015according to the embodiment are the same as those of the power headroomcontrol unit 2015 according to the first embodiment, a description ofthe same functions as in the first embodiment is omitted.

FIG. 4 is a diagram showing one example of a configuration of carriercomponents according to the second embodiment of the present invention.In FIG. 4, a horizontal axis indicates a frequency domain, the DCC-1,the DCC-2, and the UCC-1 are comprised of carrier components ofcontiguous frequency bands in the frequency domain, the DCC-3, theDCC-4, and the UCC-2 are comprised of CCs of contiguous frequency bandsin the frequency domain, and a group of the DCC-1, the DCC-2, and theUCC-1, and a group of the DCC-3, the DCC-4, and the UCC-2 are configuredin frequency domains spaced apart from each other in the frequencydomain.

As described above, since the downlink carrier components largely spacedapart from each other in the frequency domain differ in an effect of thepath loss, it becomes possible to efficiently control the PH by settingthe different dl-PathlossChange for each downlink carrier component asin the embodiment. For example, a large value of dl-PathlossChange maybe set to the downlink carrier component in which the path loss easilychanges due to moving of the mobile station apparatus 1, a small valueof dl-PathlossChange may be set to the downlink carrier component inwhich the path loss does not easily change.

In addition, when frequencies of the downlink carrier components arelargely spaced apart as shown in FIG. 4, the mobile station apparatus 1may transmit signals of the plurality of downlink carrier componentsusing different antennas and PAs. For example, in FIG. 4, thetransmission/reception antenna 211 and the PA of the mobile stationapparatus 1 which are used for transmission and reception of signalsdiffer in the DCC-1, the DCC-2, and the UCC-1, and the DCC-3, the DCC-4,and the UCC-2. As described above, when the differenttransmission/reception antennas 211-1 and 211-2 are used according tothe downlink carrier components, imbalance may occur in antenna gain.For example, since it can be considered that rapid change of the pathlosses in only a part of antennas due to an effect of an obstacle, themobile station apparatus 1 can accurately control transmission of the PHby monitoring the change of the path losses of all the downlink carriercomponents set by the base station apparatus 3 for using for wirelesscommunication.

Note that since only the path losses of the part of the downlink carriercomponents may change rapidly also when the base station apparatus 3cannot determine that the mobile station apparatus 1 is performingwireless communication using what kind of configuration of thetransmission/reception antenna 211, the mobile station apparatus 1 canaccurately control transmission of the PH regardless of theconfiguration of the transmission/reception antenna 211 of the mobilestation apparatus 1 by monitoring the change of the path losses of allthe downlink carrier components assigned by the base station apparatus3.

Note that although the mobile station apparatus 1 monitors the change ofthe path loss of one downlink carrier component in the first embodiment,and the mobile station apparatus 1 monitors the path losses of all thedownlink carrier components set by the base station apparatus 3 in thesecond embodiment, the base station apparatus 3 may set the number ofdownlink carrier components in which change of the path losses aremonitored according to the configuration of the transmission/receptionantenna 211 of the mobile station apparatus 1 to inform the mobilestation apparatus 1. In this case, it is necessary to transmit to thebase station apparatus 3 information indicating the configuration of thetransmission/reception antenna 211 of the mobile station apparatusitself, or to infer the configuration of the transmission/receptionantenna 211 of the mobile station apparatus 1 from information, such asthe PH which the base station apparatus 3 receives from the mobilestation apparatus 1. As a result of this, it becomes possible to performan efficient control of transmission of the PH according to theconfiguration of the transmission/reception antenna 211 of the mobilestation apparatus 1.

Note that although the PH has been calculated for each uplink carriercomponent in the first and second embodiments, as the PH, may becalculated a value obtained by subtracting from the maximum transmitpower value of the mobile station apparatus 1 a total of predeterminedpower values estimated for the uplink transmission of the uplink carriercomponents to which the transmission/reception antenna 211 and the PAcomprised in the mobile station apparatus 1. As a result of this, thebase station apparatus 3 can recognize remaining power for each PAcomprised in the mobile station apparatus 1, and thus power control inthe uplink according to the configuration of the PA of the mobilestation apparatus 1 can be performed.

Note that although as one MAC CE, have been configured the PHs of allthe uplink carrier components assigned to the mobile station apparatus 1by the base station apparatus, or of all the uplink carrier componentscorresponding to the downlink carrier components assigned to the mobilestation apparatus 1 by the base station apparatus 3 in the first andsecond embodiments, the different MAC CE for each PH may be configured.In this case, when the mobile station apparatus transmits all the MAC CEincluding the PHs, the power headroom control unit 2015 starts orrestarts the periodicPHR-Timer and the prohibitPHR-Timer. Namely, eventhough the mobile station apparatus transmits the PH of the part of theuplink carrier components, the power headroom control unit 2015 does notstart and restart the periodicPHR-Timer and the prohibitPHR-Timer.Alternatively, when the mobile station apparatus 1 transmits all the PHsregarding the uplink carrier components corresponding to the downlinkcarrier components in which the path losses have changed more than thedl-PathlossChange [dB], the PH control unit 2015 may start or restartthe periodicPHR-Timer and the prohibitPHR-Timer.

Third Embodiment

Hereinafter, a third embodiment of the present invention will bedescribed. In the third embodiment of the present invention, will bedescribed a method for calculating a PH when no PRB for PUSCHtransmission is assigned to a certain uplink carrier component at atiming when the mobile station apparatus 1 transmits a PH correspondingto the uplink carrier component. When compared a wireless communicationsystem according to the embodiment with the wireless communicationsystem according to the first embodiment, there is a difference in thetransmit power control unit 2013 of the mobile station apparatus 1 andthe radio resource control unit 1011 of the base station apparatus 3.However, since configurations and functions of the other components arethe same as in the first embodiment, a description of the same functionsas in the first embodiment is omitted.

In the first embodiment, in the transmit power control unit 2013 of themobile station apparatus 1, a M_(PUSCH) in calculating a PH from Formula(2) is defined to be the number of PRBs for PUSCH transmission assignedto the uplink carrier component to which the PH corresponds at a timingwhen the PH is transmitted. However, when the PRB for PUSCH transmissionis not assigned to the uplink carrier component at a timing oftransmitting a PH corresponding to a certain uplink carrier component(i.e., a timing when the mobile station apparatus 1 has decidedtransmission of the PH, a PUSCH for initial transmission has beenassigned to any uplink carrier component, and/or the mobile stationapparatus 1 decides to transmit the PH in the PUSCH based on priority ofa data signal), i.e., when the M_(PUSCH) is “0”, there is a problem thatthe PH cannot be calculated from Formula (2).

Consequently, when the PRB for PUSCH transmission is not assigned to acertain uplink carrier component at a timing of transmitting the PHcorresponding to the uplink carrier component, the transmit powercontrol unit 2013 of the mobile station apparatus 1 of the thirdembodiment calculates the PH, determining that the predetermined number(for example, “1”, or the number of PRBs assigned at the last minute forPUSCH transmission in the uplink carrier component to which the PHcorresponds, or the number of PRBs assigned to the PUSCH in the uplinkcarrier component in which the PH is transmitted, etc.) of PRBs forPUSCH transmission has been assigned to the uplink carrier component.Namely, the transmit power control unit 2013 calculates the PH,determining that the M_(PUSCH) is a predetermined value.

FIG. 5 is a diagram illustrating one example of a calculation method ofa PH according to the third embodiment of the present invention. Twouplink carrier components (UCC-1 and UCC-2) are shown in FIG. 5. Inthese two uplink carrier components, a horizontal axis indicates afrequency domain, a vertical axis indicates a time domain, and a regionhatched with oblique lines indicates a radio resource for PUSCHtransmission assigned to the UCC-2. In addition, in FIG. 5, shown aretransmit power P_(req) of the PUSCH of the UCC-1, a maximum transmitpower value P_(CMAX) of the UCC-1, and a power headroom PH of the UCC-1which are calculated by the transmit power control unit 2013. Here, asfor the transmit power P_(req), the maximum transmit power valueP_(CMAX), and the power headroom PH, a vertical axis indicates power.

When the transmit power control unit 2013 calculates a PH of the UCC-1in the uplink carrier component, UCC-1, to which the radio resource forPUSCH transmission in FIG. 5 is not assigned, it calculates the transmitpower P_(req) of the PUSCH, determining that the predetermined number(for example, “1”, or the number of PRBs assigned at the last minute forPUSCH transmission in the uplink carrier component to which the PHcorresponds, or the number of PRBs assigned to the PUSCH in the uplinkcarrier component in which the PH is transmitted, etc.) of PRBs forPUSCH transmission has been assigned to the UCC-1 (step T100). Next, thetransmit power control unit 2013 calculates the power headroom PH fromFormula (2) using the transmit power P_(req) of the PUSCH of the UCC-1and the maximum transmit power value P_(CMAX) of the UCC-1, and themobile station apparatus 1 transmits the PH of the UCC-1 in the PUSCH ofthe UCC-2 (step T101).

In addition, when the radio resource control unit 1011 of the basestation apparatus 3 of the third embodiment receives a PH of an uplinkcarrier component to which the PRB for PUSCH transmission is notassigned, it determines that the received PH is the PH which thetransmit power control unit 2013 of the mobile station apparatus 1calculates supposing that the predetermined number of PRBs for PUSCHtransmission has been assigned.

As a result of this, the mobile station apparatus 1 can calculate the PHfrom Formula (2) also when the PRB for PUSCH transmission is notassigned to a certain uplink carrier component at the timing oftransmitting the PH corresponding to the uplink carrier component.

Note that the calculation method of the PH can be applied also when themobile station apparatus transmits each PH report corresponding to theuplink carrier component at different timings. In addition, thecalculation method can be applied also when the mobile station apparatus1 transmits the PH corresponding to one uplink carrier component. Inaddition, the calculation method can be applied also when the mobilestation apparatus 1 monitors a path loss and/or change of the path lossin one or more downlink carrier components. In addition, the calculationmethod can be applied also when the base station apparatus 3 selects theuplink carrier component in which the PH is transmitted to inform themobile station apparatus.

Fourth Embodiment

Hereinafter, a fourth embodiment of the present invention will bedescribed. In the third embodiment of the present invention, will bedescribed a method for calculating a PH when the mobile stationapparatus 1 transmits the PH corresponding to a certain uplink carriercomponent in a PUSCH assigned to a different uplink carrier component.When compared a wireless communication system according to theembodiment with the wireless communication system according to the firstembodiment, there is a difference in the transmit power control unit2013 of the mobile station apparatus 1 and the radio resource controlunit 1011 of the base station apparatus 3. However, since configurationsand functions of the other components are the same as in the firstembodiment, a description of the same functions as in the firstembodiment is omitted.

In the first embodiment, in the transmit power control unit 2013 of themobile station apparatus 1, a M_(PUSCH) in calculating a PH from Formula(2) is defined to be the number of PRBs for PUSCH transmission assignedto the uplink carrier component to which the PH corresponds at a timingwhen the PH is transmitted. However, when the mobile station apparatus 1fails to detect uplink grant although the base station apparatus 3assigns a radio resource to a certain uplink carrier component, andtransmits the uplink grant indicating the radio resource assignment tothe mobile station apparatus 1, the mobile station apparatus 1determines that the radio resource is not assigned to the uplink carriercomponent, calculates a PH to transmit, but the base station apparatus 3recognizes that it has received the PH calculated based on the radioresource assigned by the base station apparatus 3 itself, thus havingcaused a problem of different interpretations of the PH between themobile station apparatus 1 and the base station apparatus 3.

Consequently, when a PH corresponding to a certain uplink carriercomponent is transmitted in a PUSCH assigned to a different uplinkcarrier component, the transmit power control unit 2013 of the mobilestation apparatus 1 of the fourth embodiment calculates the PH,determining that the predetermined number (for example, the number ofPRBs assigned to the PUSCH in the uplink carrier component in which thePH is transmitted, etc.) of PRBs for PUSCH transmission. Namely, thetransmit power control unit 2013 calculates the PH, determining that theM_(PUSCH) is a predetermined value.

In addition, when the radio resource control unit 1011 of the basestation apparatus 3 of the fourth embodiment receives the PHcorresponding to the certain uplink carrier component in the PUSCHassigned to the different uplink carrier component, it determines thatthe received PH is the PH which the transmit power control unit 2013 ofthe mobile station apparatus 1 calculates supposing that thepredetermined number of PRBs for PUSCH transmission has been assigned.

As a result of this, also when the mobile station apparatus 1 fails todetect the uplink grant transmitted by the base station apparatus 3, itcan be avoided that interpretations of the PH between the mobile stationapparatus 1 and the base station apparatus 3 are different from eachother.

Note that the calculation method of the PH can be applied also when themobile station apparatus transmits each PH report corresponding to theuplink carrier component at different timings. In addition, thecalculation method can be applied also when the mobile station apparatus1 transmits the PH corresponding to one uplink carrier component. Inaddition, the calculation method can be applied also when the mobilestation apparatus 1 monitors a path loss and/or change of the path lossin one or more downlink carrier components. In addition, the calculationmethod can be applied also when the base station apparatus 3 selects theuplink carrier component in which the PH is transmitted to inform themobile station apparatus.

Fifth Embodiment

Hereinafter, a fifth embodiment of the present invention will bedescribed. In the fifth embodiment of the present invention, will bedescribed a method in which the mobile station apparatus 1 transmits aPH (first remaining power value) of the PUSCH and/or a PH (secondremaining power value) of the PUCCH. When compared a wirelesscommunication system according to the embodiment with the wirelesscommunication system according to the first embodiment, there is adifference in the transmit power control unit 2013 of the mobile stationapparatus 1 and the radio resource control unit 1011 of the base stationapparatus 4. However, since configurations and functions of the othercomponents are the same as in the first embodiment, a description of thesame functions as in the first embodiment is omitted.

In Chapter 6 in Non-patent Document 3, simultaneous transmission of aPUSCH and a PUCCH in LTE-A is described. When the PUSCH and the PUCCHare transmitted simultaneously, if a transmit power value of the PUCCHtransmitted by the mobile station apparatus 1 is unknown, the basestation apparatus 3 cannot determine how many PRBs it may assign as aradio resource for PUSCH transmission to the mobile station apparatus 1which simultaneously transmits the PUCCH and the PUSCH. Consequently,although the mobile station apparatus 1 needs to transmit the PH of thePUCCH to the base station apparatus 3, a calculation method and atransmission method of the PH of the PUCCH have been indefinite.Consequently, a calculation method and a transmission method of the PHof the PUCCH are provided in the fifth embodiment.

When the transmit power control unit 2013 of the mobile stationapparatus 1 of the fifth embodiment is instructed to calculate a PH bythe power headroom control unit 2015, it calculates the PHs of thePUSCHs of all the uplink carrier components assigned from the basestation apparatus 3 based on Formula (2), and transmits them to the basestation apparatus 3 through the transmission unit 207. In addition, thetransmit power control unit 2013 calculates PHs of the PUCCHs of all theuplink carrier components assigned from the base station apparatus 3, orof the uplink carrier component (Note that the base station apparatus 3may inform the mobile station apparatus 1 of this uplink carriercomponent.) to which a radio resource for PUCCH transmission (radioresource for control information transmission) has been assigned fromthe base station apparatus 3 based on Formula (4), and transmits the PHsto the base station apparatus 3 through the transmission unit 207.

$\begin{matrix}\left\lbrack {{Formula}\mspace{14mu} 4} \right\rbrack & \; \\\begin{matrix}{{{PH}_{PUCCH}(i)} = {P_{CMAX}\begin{Bmatrix}{{P_{O\_ {PUSCH}}(j)} + {PL} +} \\{{h\left( {n_{CQI},n_{HARQ}} \right)} + {\Delta_{F\_ {PUCCH}}(F)} +} \\{g(i)}\end{Bmatrix}}} \\{= {P_{CMAX} - P_{{req}\_ {PUCCH}}}}\end{matrix} & (4)\end{matrix}$

When a PH of the PUCCH is calculated by Formula (4), h (n_(CQI),n_(HARQ)) and Δ_(F) _(—) _(PUCCH) are calculated as a predeterminedPUCCH format and the predetermined number of bits (for example, HARQ bitis 1 bit in a PUCCH format 1a, or channel quality information is 4 bitsin a PUCCH format 2). Alternatively, when the PUCCH is transmitted inthe uplink carrier component to which the PH of the PUCCH corresponds ata timing when the PH of the PUCCH is transmitted, the PH of the PUCCHmay be calculated from Formula (4) using the format and the number ofbits of the PUCCH transmitted by the timing and in the uplink carriercomponent. The radio resource control unit 1011 of the base stationapparatus 3 of the fifth embodiment controls a transmit power value whenthe mobile station apparatus 1 simultaneously transmits the PUCCH andthe PUSCH based on the PH of the PUCCH, and the PH of the PUSCH.

As a result of this, the mobile station apparatus 1 can calculate the PHof the PUCCH corresponding to a certain uplink carrier component totransmit to the base station apparatus 3, and the base station apparatus3 can control the number of PRBs assigned for PUSCH transmission fromthe PH of the PUCCH, and the PH of the PUSCH.

Note that the calculation method of the PH can be applied also when themobile station apparatus transmits each PH report corresponding to theuplink carrier component at different timings. In addition, thecalculation method can be applied also when the mobile station apparatus1 transmits the PH corresponding to one uplink carrier component. Inaddition, the calculation method can be applied also when the mobilestation apparatus 1 monitors a path loss and/or change of the path lossin one or more downlink carrier components. Note that the calculationmethod can be applied also when the PH of the PUCCH and the PH of thePUSCH are configured as different MAC CEs. In addition, the calculationmethod can be applied also when the PH of the PUCCH and the PH of thePUSCH are configured as the same MAC CE. In addition, the calculationmethod can be applied also when two or more of the above-describedconditions are combined with each other.

(1) In order to achieve the above-described object, the presentinvention has taken the following measures. Namely, a wirelesscommunication system of the present invention is the wirelesscommunication system in which a base station apparatus and a mobilestation apparatus perform wireless communication using a plurality ofcomponent carriers, and the wireless communication system ischaracterized in that the mobile station apparatus manages a powerheadroom which is a difference between a maximum transmit power valuedetermined for each uplink component carrier from the base stationapparatus and a predetermined power value estimated for uplinktransmission, monitors a path loss of the downlink component carrierinformed from the base station apparatus among a plurality of downlinkcomponent carriers, and when a path loss value of any downlink componentcarrier changes more than a predetermined value, the mobile stationapparatus decides transmission to the base station apparatus of thepower headroom for uplink transmission corresponding to all the downlinkcomponent carriers set from the base station apparatus.

As described above, since the mobile station apparatus monitors the pathloss of the downlink component carrier informed from the base stationapparatus, it can reduce the number of downlink component carriers inwhich change of the path losses are monitored, load of the mobilestation apparatus in monitoring the change of the path losses can bereduced, and timers can be managed in common in all the downlinkcomponent carriers, thus resulting in easy management of the timers.

(2) In addition, a mobile station apparatus of the present invention isthe mobile station apparatus in which a base station apparatus and amobile station apparatus perform wireless communication using aplurality of component carriers, and the mobile station apparatuscomprising: a power headroom control unit which manages a power headroomwhich is a difference between a maximum transmit power value determinedfor each uplink component carrier from the base station apparatus and apredetermined power value estimated for uplink transmission; and a pathloss measurement unit monitors a path loss of a downlink componentcarrier informed from the base station apparatus among the plurality ofdownlink component carriers, and the mobile station apparatus ischaracterized in that when a path loss value of any downlink componentcarrier changes more than a predetermined value, the power headroomcontrol unit decides transmission to the base station apparatus of thepower headroom for uplink transmission corresponding to all the downlinkcomponent carriers set from the base station apparatus.

As described above, since the mobile station apparatus 1 monitors a pathloss of the downlink component carrier informed from the base stationapparatus among the plurality of downlink component carriers, it canreduce the number of downlink component carriers in which change of thepath losses are monitored, load of the mobile station apparatus inmonitoring the change of the path losses can be reduced, and timers canbe managed in common in all the downlink component carriers, thusresulting in easy management of the timers.

(3) In addition, a mobile station apparatus of the present invention ischaracterized in that the mobile station apparatus is informed of anyone of the plurality of downlink component carriers from the basestation apparatus, and that the path loss measurement unit monitors apath loss of the informed any one of the downlink component carriers.

As described above, since the mobile station apparatus monitors the pathloss of the informed any one of the downlink component carriers, it canreduce the number of downlink component carriers in which change of thepath losses are monitored. In addition, when the downlink componentcarrier to which frequency band aggregation is performed is configuredin contiguous frequency domains, path losses of the other downlinkcomponent carriers can be estimated from the path loss of the downlinkcomponent carrier.

(4) In addition, a mobile station apparatus of the present invention ischaracterized in that the path loss measurement unit monitors pathlosses of all the downlink component carriers assigned from the basestation apparatus.

As described above, since the mobile station apparatus monitors the pathlosses of all the downlink component carriers assigned from the basestation apparatus, it becomes possible to efficiently and accuratelycontrol the PH when effects of the path losses differ as in the downlinkcomponent carriers largely spaced apart from each other in the frequencydomain.

(5) In addition, a mobile station apparatus of the present invention ischaracterized in that when a radio resource for uplink transmission isnot assigned to an uplink component carrier at a time when the mobilestation apparatus transmits the power headroom, the power headroomcontrol unit calculates the power headroom, determining that apredetermined amount of radio resources is assigned to the uplinkcomponent carrier.

As described above, since the PH control unit calculates the powerheadroom, determining that the predetermined amount of radio resourcesis assigned to the uplink component carrier when the radio resource foruplink transmission is not assigned to the uplink component carrier atthe time when the mobile station apparatus transmits the power headroom,the mobile station apparatus can calculate the PH using the methodsimilar to a case where the radio resource is assigned.

(6) In addition, a mobile station apparatus of the present invention ischaracterized in that when the mobile station apparatus transmits thepower headroom in an uplink component carrier other than an uplinkcomponent carrier to which the power headroom corresponds at a time oftransmitting the power headroom, the power headroom control unitcalculates the power headroom, determining that a predetermined amountof radio resources is assigned to the uplink component carrier.

As described above, since the PH control unit calculates the powerheadroom, determining that the predetermined amount of radio resourcesis assigned to the uplink component carrier when the mobile stationapparatus transmits the power headroom in an uplink component carrierother than an uplink component carrier to which the power headroomcorresponds, it can be avoided that interpretations of the PH betweenthe mobile station apparatus and the base station apparatus aredifferent from each other also when the mobile station apparatus failsto detect uplink grant transmitted by the base station apparatus.

(7) In addition, a mobile station apparatus of the present invention ischaracterized in that the mobile station apparatus further manages asecond power headroom which is a difference between a maximum transmitpower value set for each uplink component carrier from the base stationapparatus and a predetermined power value estimated for uplink controlinformation transmission, the power headroom control unit calculates thesecond power headroom, determining that a radio resource of apredetermined format is assigned to the uplink component carrier, andthe predetermined number of bits is transmitted.

As described above, since the mobile station apparatus manages thesecond power headroom which is the difference between the maximumtransmit power value set for each uplink component carrier from the basestation apparatus and the predetermined power value estimated for uplinkcontrol information transmission, the mobile station apparatus cancalculate a PH of a PUCCH corresponding to a certain uplink componentcarrier to transmit to the base station apparatus, and the base stationapparatus can control the number of PRBs assigned for PUSCH transmissionfrom the PH of the PUCCH, and a PH of a PUSCH.

(8) In addition, a base station apparatus of the present invention isthe base station apparatus in which a base station apparatus and amobile station apparatus perform wireless communication using aplurality of component carriers, and the base station apparatus ischaracterized in that the base station apparatus sets a downlinkcomponent carrier in which the mobile station apparatus described in (3)monitors a path loss, and that informs the mobile station apparatus ofthe set downlink component carrier.

As described above, since the base station apparatus informs the mobilestation apparatus of the set downlink component carrier, the mobilestation apparatus can monitor the path loss of the informed downlinkcomponent carrier.

(9) In addition, a base station apparatus of the present invention isthe base station apparatus in which the base station apparatus and amobile station apparatus perform wireless communication using aplurality of component carriers, and the base station apparatus ischaracterized in that the base station apparatus sets a predeterminedvalue for monitoring a path loss value for each downlink componentcarrier, and that informs the mobile station apparatus described in (4)of the set each predetermined value.

As described above, since the base station apparatus sets thepredetermined value for monitoring the path loss value for each downlinkcomponent carrier, it becomes possible to efficiently and accuratelycontrol the PH when effects of the path losses differ as in the downlinkcomponent carriers largely spaced apart from each other in the frequencydomain.

(10) In addition, a wireless communication method of the presentinvention is the wireless communication method of a wirelesscommunication system in which a base station apparatus and a mobilestation apparatus perform wireless communication using a plurality ofcomponent carriers, and the wireless communication method ischaracterized in that the mobile station apparatus manages a powerheadroom which is a difference between a maximum transmit power valueset for each uplink component carrier from the base station apparatusand a predetermined power value estimated for uplink transmission,monitors a path loss of the downlink component carrier informed from thebase station apparatus among a plurality of downlink component carriers,and that when a path loss value of any downlink component carrierchanges more than a predetermined value, the mobile station apparatusdecides transmission to the base station apparatus of the power headroomfor uplink transmission corresponding to all the downlink componentcarriers set from the base station apparatus.

As described above, since the mobile station apparatus monitors the pathloss of the downlink component carrier informed from the base stationapparatus among the plurality of downlink component carriers, it canreduce the number of downlink component carriers in which change of thepath losses are monitored, load of the mobile station apparatus inmonitoring the change of the path losses can be reduced, and timers canbe managed in common in all the downlink component carriers, thusresulting in easy management of the timers.

(11) In addition, a control program of the present invention is thecontrol program for a mobile station apparatus applied to a wirelesscommunication system in which a base station apparatus and the mobilestation apparatus perform wireless communication using a plurality ofcomponent carriers, and the control program is characterized in that hasbeen made to be a computer-readable and computer-executable command aseries of processing including the processing of: managing in a powerheadroom control unit a power headroom which is a difference between amaximum transmit power value set for each uplink component carrier fromthe base station apparatus and a predetermined power value estimated foruplink transmission; monitoring in a path loss measurement unit a pathloss of a downlink component carrier informed from the base stationapparatus among the plurality of downlink component carriers; anddeciding transmission to the base station apparatus of the powerheadroom for uplink transmission corresponding to all the downlinkcomponent carriers set from the base station apparatus when a path lossvalue of any downlink component carrier changes more than apredetermined value in the power headroom control unit.

As described above, since the mobile station apparatus decidestransmission to the base station apparatus of the power headroom foruplink transmission corresponding to all the downlink component carriersset from the base station apparatus when a path loss value of anydownlink component carrier changes more than a predetermined value, itcan reduce the number of downlink component carriers in which change ofthe path losses are monitored, load of the mobile station apparatus inmonitoring the change of the path losses can be reduced, and timers canbe managed in common in all the downlink component carriers, thusresulting in easy management of the timers.

A program that operates in the base station apparatus 3 and the mobilestation apparatus 1 according to the present invention may be theprogram (program that makes a computer operate) that controls a CPU(Central Processing Unit) etc. so as to achieve a function in theabove-mentioned embodiment according to the present invention.Additionally, information dealt with in these apparatuses is temporarilystored in RAM (Random Access Memory) at the time of processing thereof,subsequently stored in various ROMs, such as a Flash ROM (Read OnlyMemory), and a HDD (Hard Disk Drive), and the information is read,corrected/written by the CPU if needed.

Note that a part of the mobile station apparatus 1 and the base stationapparatus 3 in the above-mentioned first to third embodiments may beachieved with a computer. In that case, the computer may be achieved byrecording a program for achieving the above-described control functionin a computer-readable recording medium, and making the program recordedin this recording medium read in a computer system to be executed. Notethat a “computer system” referred to herein is defined to be thecomputer system incorporated in the mobile station apparatus 1 or thebase station apparatus 3, and to include hardwares, such as an OS and aperipheral device.

In addition, a “computer-readable recording medium” means a portablemedium, such as a flexible disk, a magnetic optical disk, a ROM, and aCD-ROM, and a memory storage incorporated in the computer system, suchas a hard disk. Further, the “computer-readable recording medium” mayalso include a medium that dynamically holds a program for a short timeas a communication wire used when the program is transmitted through acommunication line, such as a network like the Internet, and a telephoneline, and a medium that holds a program for a certain time as a volatilememory inside the computer system serving as a server or a client whenthe program is dynamically held for the short time. In addition, theabove-described program may be the program for achieving a part of theabove-mentioned function, and it may be the program in which theabove-mentioned function can be achieved in combination with the programhaving been already recorded in the computer system.

In addition, some or all of the mobile station apparatus 1 and the basestation apparatus 3 in the above-mentioned embodiment may be achieved asan LSI, which typically is an integrated circuit. Each functional blockof the mobile station apparatus 1 and the base station apparatus 3 maybe chipped individually, or some or all of them may be integrated to bechipped. In addition, a technique for making the functional blocks intoan integrated circuit may be achieved not only as the LSI but as adedicated circuit or a general-purpose processor. In addition, when atechnology for making the functional blocks into the integrated circuitas an alternative to the LSI appears due to progress of a semiconductortechnology, it is also possible to use an integrated circuit made by thetechnology.

As described above, although one embodiment of the present invention hasbeen described in detail with reference to the drawings, a specificconfiguration is not limited to the above, and various changes of adesign etc. can be made without departing from the scope of the presentinvention.

DESCRIPTION OF SYMBOLS

1 (1A, 1B, and 1C) MOBILE STATION APPARATUS

3 BASE STATION APPARATUS

101 HIGHER LAYER PROCESSING UNIT

103 CONTROL UNIT

105 RECEPTION UNIT

107 TRANSMISSION UNIT

201 HIGHER LAYER PROCESSING UNIT

203 CONTROL UNIT

205 RECEPTION UNIT

207 TRANSMISSION UNIT

209 PATH LOSS MEASUREMENT UNIT

1013 POWER HEADROOM SETTING UNIT

2015 POWER HEADROOM CONTROL UNIT

1. A mobile station apparatus comprising: a transmitter configured totransmit a physical uplink control channel; and a transmission powercontroller configured to compute a transmit power for a physical uplinkcontrol channel transmission in a subframe based on a physical uplinkcontrol channel format for the physical uplink control channeltransmission in the subframe, wherein in a case that the transmitterdoes not transmit the physical uplink control channel in the subframe,the transmission power controller is configured to assume that thetransmit power for the physical uplink control channel transmission inthe subframe is computed based on a predefined physical uplink controlchannel format.
 2. The mobile station apparatus according to claim 1wherein the predefined physical uplink control channel format is aphysical uplink control channel format 1a.
 3. The mobile stationapparatus according to claim 1, wherein the predefined physical uplinkcontrol channel format is for one HARQ (Hybrid Automatic Repeat reQuest)bit.
 4. A communication method for a mobile station apparatus, thecommunication method comprising: transmitting a physical uplink controlchannel; and computing a transmit power for a physical uplink controlchannel transmission in a subframe based on a physical uplink controlchannel format for the physical uplink control channel transmission inthe subframe, wherein in a case that the physical uplink control channelin the subframe is not transmitted, an assumption is performed, theassumption being that the transmit power for the physical uplink controlchannel transmission in the subframe is computed based on a predefinedphysical uplink control channel format.
 5. A mobile station apparatuscomprising: a transmission power controller configured to compute apower headroom for a certain subframe for a certain uplink componentcarrier; and a transmitter configured to transmit a power headroomreport, wherein in a case that the transmitter transmits a physicaluplink shared channel in the certain subframe for the certain uplinkcomponent carrier, the transmission power controller is configured tocompute the power headroom based on a first logarithm of a first valueof a parameter associated with a number of physical resource blocks fora transmission of the physical uplink shared channel in the certainsubframe for the certain uplink component carrier, and in a case thatthe transmitter does not transmit the physical uplink shared channel inthe certain subframe for the certain uplink component carrier, thetransmission power controller is configured to compute the powerheadroom based on a second logarithm of a second value of the parameter,the second logarithm of the second value of the parameter being zero. 6.A communication method for a mobile station apparatus, the communicationmethod comprising: computing a power headroom for a certain subframe fora certain uplink component carrier; and transmitting a power headroomreport, wherein in a case that a physical uplink shared channel in thecertain subframe for the certain uplink component carrier istransmitted, the power headroom is computed based on a first logarithmof a first value of a parameter associated with a number of physicalresource blocks for a transmission of the physical uplink shared channelin the certain subframe for the certain uplink component carrier, and ina case that the physical uplink shared channel in the certain subframefor the certain uplink component carrier is not transmitted, the powerheadroom is computed based on a second logarithm of a second value ofthe parameter, the second logarithm of the second value of the parameterbeing zero.
 7. A base station apparatus comprising: an antenna; and areceiver configured to receive, via the antenna, a power headroomreport, wherein in a case that the receiver receives a physical uplinkshared channel in a certain subframe for a certain uplink componentcarrier, a power headroom is computed based on a first logarithm of afirst value of a parameter associated with a number of physical resourceblocks for a transmission of the physical uplink shared channel in thecertain subframe for the certain uplink component carrier, and in a casethat the receiver does not receive the physical uplink shared channel inthe certain subframe for the certain uplink component carrier, the powerheadroom is computed based on a second logarithm of a second value ofthe parameter, the second logarithm of the second value of the parameterbeing zero.